John R. Bolton, the former White House national security adviser, has announced that he is willing to give evidence in the impeachment trial of President Trump. The question is: Will the Senate — and the majority leader, Mitch McConnell — let that happen? Guest: Julie Hirschfeld Davis, the congressional editor of The New York Times. For more information on today’s episode, visit nytimes.com/thedaily. Background reading:Mr. Bolton’s announcement was an unexpected turn that could alter the political dynamic of the impeachment process, raising the possibility of Republican defections.In response, Mr. McConnell said that he had the votes he needed to quickly acquit the president without calling witnesses or hearing new evidence.